Seiko

nikidasi
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Grand Seiko SBGV009 cal. 9F82 first year accuracy report

Hi, all, 

I bought this GS SBGV009 quartz one year ago (July 2014). Upon receiving the watch, I set it by referring to time.is. 

This is the first pic taken on 17 July 2014. 
 


About six months later, it was roughly 0.5 second behind (-0.5 second per 6 month). Pic was taken on 9 January 2015. 
 


Today I checked again its accuracy against time.is and the result is 1 second ahead (+1 second per 1 year). Pic taken today. 
 


But I didn't adjust the GS to compensate for the Extra Leap Second which happened last month on 30 June 2015, 23:59:60. Which means the actual accuracy of my watch is 0 second per year for the first year (!). During the first year I also casually observed the deviation between the watch and time.is. It deviated to -0.5 second during the first six months, and then slowly gaining back to 0 second deviation. 

Maybe the quartz crystal still went through aging process during the first 6 months? Or probably it's the "backlash" in the Temperature Compensator unit? I am not sure and would love to hear opinions from HAQ expert. Anyhow, the accuracy is awesome. Much better than the official spec for cal. 9F82 in which SEIKO "only" promises to deliver accuracy within -/+ 10 second/year. I am curious about others' GS 9F out there. Am I just lucky? Any accuracy freak around here care to share your observation?  

Thanks.